Chemistry, 18.12.2019 06:31 ajyoung3142005oztpya
You are dating moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion years) and its ultimate decay product, lead.
1. find the age for a rock for which you determine that 55% of the original uranium-238 remains, while the other 45% has decayed into lead.
2. find the age for a rock for which you determine that 68% of the original uranium-238 remains, while the other 32% has decayed into lead.
Answers: 1
![-kt = ln[\frac{FinalAmount}{InitialAmount}]](/tpl/images/0423/9056/e9d33.png)
![t = - \frac{4.5}{ln2} \times ln[\frac{0.55}{1}]](/tpl/images/0423/9056/ff6e0.png)
![t = - \frac{4.5}{ln2} \times ln[\frac{0.63}{1}]](/tpl/images/0423/9056/f1017.png)
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You are dating moon rocks based on their proportions of uranium-238 (half-life of about 4.5 billion...
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